errr... need help!

im in an 08 freghtliner cascadia, and since i got in this truck, about 2 months ago, my cb has not worked... i have a cobra 29ltd. I was in a volvo before this truck and it worked great, i could get 5miles around my truck, five or take, right out the box, now im lucky to hear the guy sitting right next to me... it appears as tho the anttena on the driver side is not the orig one, that the previous driver replaced it, it does not look the same as the passanger side, and its bigger, and passing other cascadias it looks different, so im thinking maybe i need a new antenna, but i wanna no from you cb pros if this is all the problem is before i go buy a new one and still have the same problem. i dont want, or need my cb tweaked or tuned, id really like it back to how it was in the volvo.( without getting back into the volvo. )
any suggestions?

 

see im trying not to go spend the money on a cb shop, i really dont think that its an actual cb issue, as cactus suggested it might be a bad connection or bad ground, and thats the other thing i was thinking, along with a bad antenna... im going to have some down time this afternoon, or over the weekend, i think im going take the wires apart and see if i cant find the problem, then ill consider lookin for a cb shop.
thanks to all for the advise, im still hoping someone can post some more possiable issues

thanks again

 

ok, cactus ill try as u have said as soon as i get a chance,
but i got to one of our shops and had them go to the freightliner and get be the proper antenna for a cascadia. got it, put it up and its alomost 90% better, however, iv noticed that when my regualr am/fm radio is on, and im listening to my music, sometime my cb static will go to the beat of the music, this truck, has in it a factory sub woofer under the bunk and noticed that it only happens when i the subs are kikin, sooooo bow im thinking i might have the bad ground problem???

also, on the cascadia the antennas are not mounted on the mirror, they are mounted on the side of the roof/sleeper area... im thinking getting to the wire is going to be more work then i first thought...
also, i just googled cascadiea antenna mounts and came across a few " problem with cascadia cb antenna " site... hmm...
thanks for the input everyone... im thinking ill be seeing a cb shop in the near future.. so would anyone know of a trust worthy antenna along my regular rout
atlanta ga, 75n to either Mi or 75 from atlanta to 71 in oh to youngstown and often 81n from tn to pa
i no that the TA in knoxville has a cb shop, anyone know anything about him?
and also i no the Petro in Carlisle Pa has one as well...